Update config.yml

Author: kt3k

.circleci/config.yml

@@ -22,6 +22,11 @@ jobs:
     docker:
       - image: circleci/node:8
     steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-{{ checksum "package.json" }}
+      - run: npm i
       - run: ./update.sh
 workflows:
   version: 2